type _At<Arr> = Arr extends (infer T)[] ? T | undefined : Arr extends RelativeIndexable<infer T> ? T | undefined : never;
export type At<Arr, Index extends number> = Arr extends readonly [] ? undefined : Index extends 0 ? Arr extends readonly [infer a, ...unknown[]] ? a : _At<Arr> : Index extends 1 ? Arr extends readonly [unknown, infer b, ...unknown[]] ? b : _At<Arr> : Index extends -1 ? Arr extends readonly [...unknown[], infer z] ? z : _At<Arr> : Index extends 2 ? Arr extends readonly [unknown, unknown, infer c, ...unknown[]] ? c : _At<Arr> : Index extends -2 ? Arr extends readonly [...unknown[], infer y, unknown] ? y : _At<Arr> : Index extends 3 ? Arr extends readonly [
    unknown,
    unknown,
    unknown,
    infer d,
    ...unknown[]
] ? d : _At<Arr> : Index extends -3 ? Arr extends readonly [...unknown[], infer x, unknown, unknown] ? x : _At<Arr> : _At<Arr>;
export declare function isRelativeIndexable(array: unknown): array is RelativeIndexable<unknown>;
/** @throws On `undefined` return values */
export declare function at<Arr extends readonly unknown[], Index extends number & keyof Arr>(array: Arr, index: Index): Exclude<At<Arr, Index>, undefined>;
/**
 * Same as `at`, but does not throw - returns `undefined` if the element does
 * not exist.
 */
export declare function tryAt<Arr extends readonly unknown[], Index extends number & keyof Arr>(array: Arr, index: Index): At<Arr, Index>;
export {};
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